vichy wrote:
Dear all:
while tracing 8250.c, serial8250_init, I find all the ports are
assigned with the same uart_driver 8250 as below:
static struct uart_driver serial8250_reg = {
.owner = THIS_MODULE,
.driver_name = "serial",
.dev_name = "ttyS",
.major = TTY_MAJOR,
.minor = 64,
.nr = UART_NR,
.cons = SERIAL8250_CONSOLE,
};
what make me curious is the minor# above is 64, but the minor number
of /dev/ttyS1 is 65.
Numbering starts at 0, the first serial port (/dev/ttyS0) is assigned minor 64.
Martyn
My questions are below:
1. if I want my /dev/ttyS1 work, since I want to take it to running
KGDB, should I call serial8250_init twice and pass the second
serial8250_init with another uart_driver with minor number 65?
2. The digit number of ttys* means ports or something else?
if it means port, why we give him another minor number?
Or the kernel will find the driver with the digit as port index
instead of checking the minor number.
appreciate your help,
vichy
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Martyn Welch MEng MPhil MIET (Principal Software Engineer) T:+44(0)127322748
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